A candle is placed at a distance of 15 cm from of a concave mirror with a focal length of 5 cm. The candle is 8 cm tall. Where is the image located? square
20. How much heat in calories, is needed to raise the temperature of 125.0 g of Lead (c_(lead)=0.130J/g^circ C) from 17.5^circ C to 41.1^circ C? Use Q=mc^wedge T 4.18 Joules 23.6 Joules 91.7 calories .130J/gC
19. After 32 days 5 milligrams of an 80-milligram sample of a radioactive isotope remains unchanged. What is the half-life of this element? 40 grams 32 days 4 days 8 days
4. Two air hockey pucks are slid directly toward each other. They both have a mass of 0.42 kg The blue air hockey puck is moving to the right at 18m/s while the red air hockey puck is moving to the left at 7m/s When the objects collide, the red puck now is moving at 11m/s to the right. Friction is negligible. a. What is the momentum of the blue puck BEFORE the collision? b. What is the momentum of the red puck BEFORE the collision? c. What is the total momentum of the pucks BEFORE they collide? d. Neglecting friction, what is the velocity of the blue puck after they collide? e. What is the total momentum of the pucks AFTER they collide?
Why does all light have a wavelength between about 400 and 700 nm? A Wavelengths outside that range travel more slowly B The air acts as a prism to convert other wavelengths toward this range. C We define light as the wavelengths that stimulate our receptors D Wavelengths outside that range cannot travel very far through the air.
If the Sun is the nize of a miniature soccer ball and is placed on the goal of a soccer field, the next otar would be how far away? 10,000 km 700 km
Do 1. (Velocity)^wedge 2=2(Acceleration)(Distance) 1. Acar accelerates unformly from rest to a speed of 30m/s over a distance of 150 m. What is the acceleration of the can? 2m/s^2 3m/s^2 4m/s^2 5m/s^2
Which of the following best describes the image for a thin converging lens that forms whenever the object is at a distance less than one focal length of the lens. inverted A. enlarged real upright B. enlarged virtual upright C. reduced virtual inverted D. reduced real
What happens to the mass number and atomic number of an atom after beta decay? mass #increases by 2 and the atomic number decreases by 4 mass # decreases by 4 and the atomic # decreases by 2 mass # stays the same and the atomic #increases by 1 nothing changes
Mercury, Venus, Earth, and Mars are smaller in size and closer to the Sun than Jupiter,Saturn, Uranus, or Neptune. True or False True False
A certain wave function is given by $\psi (x)=\{ \begin{matrix} A&for-a\leqslant x\leqslant a\\ 0&otherwise\end{matrix} $ Which of the following corresponds to the Fourier transform for this wave function? A sum of spherical harmonics. A sum of sines and cosines. A sum of Hankel functions. The Dirac delta function.
8> What is the random capture theory? Which theory best explains how our solar system was created?
Which of the following expressions correspond to the energy-time uncertainty principle? $\Delta E\Delta t\geqslant 2\bar {h}$ $\Delta E\Delta t\geqslant \hat {h}$ $\Delta E\Delta t\geqslant \frac {h}{2}$ $\Delta \omega \Delta t\geqslant \bar {h}$
A wave function can be expanded in basis states as $\vert \psi \rangle =\sum _{n}a_{n}\vert \psi _{n}\rangle $ What must be true of the expansion coefficients? $\sum _{n}\vert a_{n}\vert ^{2}=1$ They must be real numbers. There is no restrictions on the coefficients. $\sum _{n}a_{n}=1$
Match each statement to the wave interaction it describes. \begin{array}{|l|l|} \hline\ reflection\ &\ Waves\ bounce\ off\ an\ object.\ \\ \hline\ absorption\ &\ Waves\ are\ taken\ in\ by\ an\ object.\ \\ \hline\ transmission\ &\ Waves\ bend\ while\ passing\ from\ one\ medium\ to\ another.\ \\ \hline\ diffraction\ &\ Waves\ scatter\ through\ an\ opening\ or\ around\ an\ object.\ \\ \hline\ retraction\ &\ Waves\ go\ through\ an\ object.\ \\ \hline \end{array}
Consider the following force: A fridge magnet is pulling on a paper clip. According to Newton's third law what other force must be happening? The paper clip is pushing on the fridge magnet. The paper clip is pulling on the fridge magnet.
For Newton's third law the action and reaction forces are equal in magnitude and opposite in direction. A True B False
Which one of the following actions will increase the current ratio, all else constant? Assume the current ratio is greater than 1.0
11. ¿Qué es un campo gravitacional? A) Una región donde se experimenta una fuerza eléctrica. B) Una región donde se experimenta una fuerza magnética. C) Una región donde se experimenta una fuerza gravitacional D) Una región sin ninguna fuerza.
Why is a solid less compressible than a gas? Gases have more volume Solids are made of metals Solid particles are tightly packed Solids are heavier
